How do I create a class or group?

First go to the Teams screen in the People tab; tap Edit>New Team and then tap on the new team (e.g. Group1) to edit the name. Tap Done, then tap on the group name. If the individual folks are already in the app, just tap on them to include them. If not, tap on Add New People at the bottom of the list. You then have a choice: tap Select From Contacts to choose from your device's' s contact list, OR type the names into the big field, OR copy and paste from another source. As it says, you can separate names with commas or returns (use quotes to include a comma within a name). So: John Doe, "John Dozer, MD", Michael Smith

After any name, you can add an email address in angle brackets. For example, John Smith<jsmith@company.com>. Conveniently, this is the format that email apps use, so you should be able to cut/paste directly from a To: or cc: line. 

Tip: If you have a master list available as text, copy and paste it into the import field, but be sure to do it in All People to avoid adding everyone to a particular group. Then you can create each group and assign each person to the appropriate group (or more than one).